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Disturbance of Water-Extractable Phosphorus Determination by Colloidal Particles in a Heavy Clay Soil from the Netherlands

^a Alterra, Wageningen University and Research Centre (WUR), P.O. Box 47, 6700 AA, Wageningen, the Netherlands
^b Department of Soil Quality, Wageningen University, WUR, P.O. Box 85, 6700 EC, Wageningen, the Netherlands

View larger version (22K): [in a new window]   Fig. 1. Relationship between water-extractable phosphorus (Pw) measured after addition of the molybdate reagent, and absorption measured at 882 nm in a second subsample of the same filtrate without the molybdate reagent. The filled squares represent the Pw values measured in a third subsample, after addition of NaCl and 0.45-µm filtration. The symbol *** indicates significance at the 0.001 probability level.

View larger version (13K): [in a new window]   Fig. 2. Relationship between P extractable with 1:10 (w/v) 0.01 M CaCl2, and water-extractable phosphorus (Pw) measured after addition of NaCl and 0.45-µm filtration (open squares). The filled square deviates significantly from the relationship. The symbol *** indicates significance at the 0.001 probability level.